shiny - huge explosion caused either by nuke, or destruction of Singularity Reactor

skydust - Stardust on a terraformed spire

stiletto - old name for Thunderbird (disarming plane)

selfd - Self Destruct - usually meant as an encouragement to self destruct all your things using CTRL+A, CTRL+D keys to end the game; sometimes to self destruct a single unit for its powerful death explosion

shield-ball - A group of units that have shields, usually containing thugs, felons, and possibly an aspis(mobile area shield)